I’m migrating from Spring Boot to Micronaut framework. As of now it’s been pretty smooth transition, but now I have a small concern that I’ve been stuck for a while.

I’m using TinyRadius-netty lib in order to send/receive RADIUS packets via my app. After migration my app logs following error:

Caused by: java.lang.ExceptionInInitializerError: null
    at org.tinyradius.core.dictionary.parser.DictionaryParser.parseDictionary(DictionaryParser.java:38)
    at com.example.connector.radius.impl.RadiusDictionaryHolder.init(RadiusDictionaryHolder.java:27)
    at com.example.connector.radius.impl.$RadiusDictionaryHolder$Definition.initialize(Unknown Source)
    at com.example.connector.radius.impl.$RadiusDictionaryHolder$Definition.instantiate(Unknown Source)
    at io.micronaut.context.DefaultBeanContext.resolveByBeanFactory(DefaultBeanContext.java:2332)
    ... 42 common frames omitted
Caused by: java.lang.UnsupportedOperationException: No class provided, and an appropriate one cannot be found.
    at org.apache.logging.log4j.LogManager.callerClass(LogManager.java:585)
    at org.apache.logging.log4j.LogManager.getLogger(LogManager.java:610)
    at org.apache.logging.log4j.LogManager.getLogger(LogManager.java:597)
    at org.tinyradius.core.dictionary.parser.ResourceParser.<clinit>(ResourceParser.java:22)
    ... 47 common frames omitted

It’s seems to be some minor dependency problems, but so far I couldn’t find resolution for this.

In project I’m using logback as logger implementation. I used same earlier with Spring Boot and there was no problems.

That’s my parent POM:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <parent>
        <groupId>io.micronaut.platform</groupId>
        <artifactId>micronaut-parent</artifactId>
        <version>4.3.7</version>
    </parent>

    <groupId>com.example</groupId>
    <artifactId>radius-tool</artifactId>
    <version>1.0.1-SNAPSHOT</version>
    <packaging>pom</packaging>
    <name>radius-tool</name>
    <description>Demo</description>

    <modules>
        ...
    </modules>

    <properties>
        <package.name>radius-app</package.name>
        <jdk.version>19</jdk.version>
        <java.version>19</java.version>
        <release.version>19</release.version>
        <micronaut.version>4.3.7</micronaut.version>
        <micronaut.aot.enabled>false</micronaut.aot.enabled>
        <micronaut.aot.packageName>com.example.aot.generated</micronaut.aot.packageName>
        <micronaut.runtime>netty</micronaut.runtime>
        <exec.mainClass>com.example.app.Application</exec.mainClass>

        ...
    </properties>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <!-- Uncomment to enable incremental compilation -->
                    <!-- <useIncrementalCompilation>false</useIncrementalCompilation> -->

                    <annotationProcessorPaths combine.self="override">
                        <path>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                            <version>${lombok.version}</version>
                        </path>
                        <path>
                            <groupId>io.micronaut</groupId>
                            <artifactId>micronaut-inject-java</artifactId>
                            <version>${micronaut.core.version}</version>
                        </path>
                        <path>
                            <groupId>io.micronaut.serde</groupId>
                            <artifactId>micronaut-serde-processor</artifactId>
                            <version>${micronaut.serialization.version}</version>
                            <exclusions>
                                <exclusion>
                                    <groupId>io.micronaut</groupId>
                                    <artifactId>micronaut-inject</artifactId>
                                </exclusion>
                            </exclusions>
                        </path>
                        <path>
                            <groupId>io.micronaut</groupId>
                            <artifactId>micronaut-graal</artifactId>
                            <version>${micronaut.core.version}</version>
                        </path>
                        <path>
                            <groupId>io.micronaut</groupId>
                            <artifactId>micronaut-http-validation</artifactId>
                            <version>${micronaut.core.version}</version>
                        </path>
                    </annotationProcessorPaths>
                    <compilerArgs>
                        <arg>-Amicronaut.processing.group=com.example</arg>
                        <arg>-Amicronaut.processing.module=radius-tool</arg>
                    </compilerArgs>
                </configuration>
            </plugin>
        </plugins>
    </build>

    <dependencies>
        ...

        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-classic</artifactId>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-core</artifactId>
            <scope>compile</scope>
        </dependency>

        ...
    </dependencies>

</project>

That’s my POM where Micronaut app starts (main):

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.example</groupId>
        <artifactId>radius-product</artifactId>
        <version>1.0.1-SNAPSHOT</version>
    </parent>

    <artifactId>radius-product</artifactId>
    <packaging>jar</packaging>

    <build>
        <plugins>
            <plugin>
                <groupId>io.micronaut.maven</groupId>
                <artifactId>micronaut-maven-plugin</artifactId>
                <configuration>
                    <configFile>aot-${packaging}.properties</configFile>
                </configuration>
            </plugin>

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-enforcer-plugin</artifactId>
            </plugin>

            <plugin>
                <artifactId>maven-assembly-plugin</artifactId>
                <version>${maven.assembly.plugin.version}</version>
                <configuration>
                    <descriptors>
                        <descriptor>src/assembly/dep.xml</descriptor>
                    </descriptors>
                    <finalName>radius-app-${project.version}</finalName>
                    <appendAssemblyId>false</appendAssemblyId>
                </configuration>
                <executions>
                    <execution>
                        <id>create-archive</id>
                        <phase>package</phase>
                        <goals>
                            <goal>single</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>

        <finalName>${package.name}-${project.version}</finalName>
    </build>

</project>

What I tried:

• exclude log4j dep from tinyradius:

            <dependency>
                <groupId>com.globalreachtech</groupId>
                <artifactId>tinyradius-netty</artifactId>
                <version>${tinyradius.version}</version>
                <exclusions>
                    <exclusion>
                        <groupId>org.apache.logging.log4j</groupId>
                        <artifactId>log4j-slf4j-impl</artifactId>
                    </exclusion>
                </exclusions>
            </dependency>

• move to log4j from logback implementation

My current observations:

• problem hasn’t occurred on Spring Boot
• problem is not occurring when running inside IDE (IDEA)

Any suggestions will be much appreciated!